Question: What is the safety classification and labelling of the occupational carcinogen that starts with "b"?
Paraphrase: What is the safety classification and labelling of the occupational carcinogen that starts with "b"?
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q21074597 . ?sbj wdt:P4952 wd:Q2005334 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'b')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: benzene, benzene